In case you don't know a solution by geoo can be found in the replay collection
here.
I found a solution that leaves a climber spare as well so I assume it's like Proxima's.
Edit: I found a solution which uses all the climbers but has a jumper spare. It's basically a variation of my first one.
I've attached both solutions (v. 0.9.4) but it's possible that they are just the same as geoo's or Proxima's.
Edit2: I see now that the level I solved has a later built date, so probably it's just another version.